Kentik

OCTOBER 4, 2021

Included in the withdrawn prefixes were the IP addresses of Facebook’s authoritative DNS servers, rendering them unreachable. For example, in IPv4, Facebook authoritative server a.ns.facebook.com resolves to the address 129.134.30.12 which is routed as 129.134.30.0/24 24 and 129.134.30.0/23.

TCP 145

TCP DNS Server Media 145

Engineering at Meta

MARCH 6, 2024

Meta servers push messages to connected clients over a persistent connection. Third-party servers are responsible for hosting any media files their client applications send to Meta clients (such as image or video files). WhatsApp uses the Noise Protocol Framework to encrypt all data traveling between the client and the WhatsApp server.

Protocol 135

Protocol Encryption Server Media 135

ByteByteGo

NOVEMBER 30, 2024

When you want to send the JWT to a server, you put the header, payload, and signature inside the box. Then you send it over to the server. The server can easily read the header and payload to understand who you are and what you want to do. However, it still used TCP as the underlying protocol.

TCP 100

TCP Protocol Server Email 100

Network Engineering

JANUARY 25, 2025

Could I use two instances of netcat a server and a client with the IPv6 ff02::1 multicast address? Either would be fine; I just want to experiment and see how can I use a multicast address to send/receive either tcp or udp packets. I'm not even sure what I can do liste to multicast? Only send data to multicast?

TCP 52

TCP Server 52

Kentik

SEPTEMBER 20, 2021

Packet loss in TCP connections results in retransmissions which can introduce significant latency. Below is the beginning of a TCP handshake. Although the ping utility on our computers uses ICMP, which is the first to see latency, other utilities similar to ping can execute tests similar to ping on top of TCP and UDP.

TCP 116

TCP Routers Bandwidth IP Address 116

Heroku

NOVEMBER 21, 2024

After thorough router investigation and peeling back Pumas server code, we realized what we had stumbled upon was not actually a Router 2.0 Reproduction The long response times issue first surfaced through a customer support ticket for an application running a Puma + Rails web server. ec2:11059 tcp 0 0 ip-10-1-87-57.ec2:28631

Routers 59

Routers TCP Server DNS 59

Network Engineering

JANUARY 23, 2025

After the connection is disrupted, when I attempt to send a packet from the server using the previously established socket, the router responds with a RST (reset) packet. I have a router that uses a SIM card for connectivity, and I create a socket connection. However, this SIM card often experiences connectivity issues.

Routers 52

Routers TCP Firewall Server 52

Network Engineering

JANUARY 15, 2025

I have a TCP server running on my Ubuntu gateway computer at 10.0.0.1:8080. 8080 [link] , I see the correct traffic returning and logs showing from my server on 8080. My Wi-Fi is connected to the gateway's LAN (enp4s0) port, and my modem is in bridge mode and plugged into enp3s0.

LAN 52

LAN Gateway TCP Port 52

CloudFaire

DECEMBER 30, 2024

A recap of QUIC and HTTP/3 QUIC is a secure-by-default transport protocol that provides performance advantages compared to TCP and TLS via a more efficient handshake, along with stream multiplexing that provides head-of-line blocking avoidance. Server receives the request HEADERS frame and validates it against RFC 9114 rules.

Protocol 101

Protocol Server Internet TCP 101

Kentik

JANUARY 13, 2021

Send these pings using the Internet Control Message Protocol (ICMP) or TCP to one or any of the devices you believe to be involved. Ping is a utility that’s available on practically every system, be it a desktop, server, router, or switch. If that’s the case, you should consider TCP Traceroute on Linux, which switches to TCP packets.

Network 114

Network Networking TCP Protocol 114

Kentik

JANUARY 10, 2022

To be more specific: slowness can be introduced as your digital connection traverses your PC, the local wifi/wired connection, the local ISP, the Tier 1 or Tier 2 provider, or the CDN that provides the hardware which hosts the web server running the application. The use of ICMP vs. TCP or UDP to carry the ping can also be a factor.

IP Address 98

IP Address DNS TCP Application 98

CATO Networks

JUNE 14, 2023

In most cases, these patterns are evaluated on a single network packet, rather than a sequence of flows between a client host and a server. MAC address in the data link layer of a packet capture Moving up the stack, at the network and transport layers, is a much more granular source of information, the TCP/IP stack.

IoT 52

IoT TCP Protocol Server 52

CloudFaire

DECEMBER 20, 2024

Websockets operate over a single, persistent TCP connection established between a client and server. If you were building a chat application prior to WebSockets, you would likely have your client-side app poll the server every n seconds to see if there are new messages to be displayed.

Application 85

Application Server TCP Gateway 85

Kentik

FEBRUARY 27, 2023

Though massive, the underlying database itself is also highly distributed among many servers and locations, making getting the data and serving the data needed for a query happen in parallel. With just a few clicks, you can mine the database for TCP retransmits, TCP fragments, client latency, flow information, and dozens of other metrics.

Network 98

Network Networking TCP IP Address 98

Kentik

JANUARY 24, 2022

Source port for UDP or TCP, 0 for other protocols. Destination port for UDP or TCP, type and code for ICMP, or 0 for other protocols. If you are thinking that those represent HTTP and HTTPS, you would be largely correct, but that doesn’t mean it’s traffic involving web servers. Source IP address. Destination IP address.

Application 96

Application IP Address DNS Port 96

Slack Engineering

OCTOBER 10, 2024

This is the story of a tricky bug we encountered last July and the lessons we learned along the way about being careful with TCP state. Our code suggested that the closed state is only a function of the writer, which is controlled by the application server, not the reader.

Server 76

Server TCP Application Engineering 76

Kentik

APRIL 3, 2023

event(data) duration = float(event) / 1000000 print("TCP retransmit detected (duration: %0.2f Higher level abstractions For another level of abstraction, open source tools have emerged, such as Cilium , which runs as an agent in container pods or on servers. tcpdrop allows you to trace TCP packet drops.

TCP 110

TCP Application Virtual machine Network 110

Network Engineering

DECEMBER 16, 2015

nat (inside,dmz) static 123.123.27.134 service tcp ssh ssh access-list OUTSIDE extended permit tcp any host 123.123.27.134 eq ssh However, when I do that, and try to telnet to port 22 on 123.123.27.134 I end up on a server that does not even belong to us and SSH version that I do not expect. Stripped for readability.

IP Address 52

IP Address Port TCP Server 52

Kentik

DECEMBER 18, 2019

we never initiate connections to the customers) on servers running Debian GNU/Linux. We tested different designs during an evaluation cycle and we decided to go with LVS/DSR (Linux Virtual Server / Direct Server Return), which is a load-balancing setup traditionally used for website load balancers, but it worked well for BGP connections, too.

Server 13

Server Topology TCP Network 13

CATO Networks

DECEMBER 24, 2019

Additionally, Catos cloud-native network stack leverages network optimization techniques and tools like TCP proxies and advanced congestion management algorithms to improve WAN throughput. Just how effective is Cato Cloud at optimizing the middle mile? Latency to the designated PoP is minimized by Catos intelligent routing.

WAN 52

WAN Network Networking TCP 52

Kentik

MARCH 31, 2020

One of the key elements of Espresso is the software-defined peering driven by measuring every TCP connection but done at each server. The platform, known as Espresso , understands the applications and importance for making routing decisions to optimize performance. Google can build a sampled aggregate of the performance.

WAN 88

WAN Network Networking TCP 88

Kentik

SEPTEMBER 20, 2016

For example, using SNMP or flow data to track traffic volume on interfaces, servers, and devices can provide necessary visibility into possible congestion points. In this post we’ll talk about using Kentik’s NPM solution to watch the TCP performance of traffic as reported to Kentik Detect from a Kentik nProbe host agent.

Network 40

Network Networking TCP Server 40

Network Engineering

JULY 3, 2021

inside no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart crypto ipsec security-association lifetime seconds 28800 crypto ipsec security-association lifetime kilobytes 4608000 telnet timeout 5 ssh timeout 5 console timeout 0 dhcpd auto_config outside !

VPN 52

VPN IP Address Encryption TCP 52

CATO Networks

JUNE 1, 2020

Proxy TCP Connections Fundamentally, TCP (Transmission Control Protocol) connections inherently add more overhead than their UDP (User Datagram Protocol) counterparts. At scale, this leads to scenarios where TCP connections can significantly contribute to network congestion and reduce throughput.

Network 52

Network Networking TCP MPLS 52

CATO Networks

MARCH 24, 2020

At the beginning of the month, Microsoft released an advisory and security patch for a serious Windows Server Message Block (SMB) vulnerability called the Windows SMBv3 Client/Server Remote Code Execution Vulnerability (AKA Windows SMBv3 RCE or CVE-2020-0796). This would solve the problem for SMB servers but not SMB clients.

SMB 52

SMB Port Server Protocol 52

Kentik

OCTOBER 12, 2021

Once you saw a person’s password to any given application, you knew they were generally using the same one for all of their other applications — email, the ticketing system, the FTP and Novell servers, etc. HTTP is the new TCP. Well, that didn’t last long. Encrypted passwords came along as did token authentication.

Encryption 84

Encryption DNS IP Address Protocol 84

Kentik

MAY 2, 2018

During last week’s attack, the attacker was redirecting traffic that belonged to Amazon’s Route 53 DNS servers. Below is a diagram of how this attack worked: Once the attackers have the DNS requests coming to them, they can respond with the IP address of a server they control.

IP Address 49

IP Address DNS UDP port Advertising 49

Kentik

DECEMBER 5, 2016

Next we set Metric (still in the Query pane) to look at the percentage of TCP retransmits. What immediately jumps out from the graph is that there is a significant spike in the percentage of retransmitted TCP packets for these three hosts. Is It One of Our Servers? But was the issue possibly within Kentik’s own infrastructure?

Network 40

Network Networking TCP IP Address 40

Confluent

FEBRUARY 21, 2019

KSQL queries get executed as Kafka Streams applications by the KSQL server, removing the necessity of writing Java code for real-time stream processing. KSQL server is running and configured to read from the Kafka brokers. KSQL CLI is running and configured to talk to KSQL server and send interactive queries.

IP Address 83

IP Address Server Application Networking 83

CATO Networks

AUGUST 18, 2022

Included features like QoS, TCP Acceleration, and Packet Loss Mitigation allow customers to fine-tune performance to their needs. Customers can control the use of TCP acceleration and Packet Loss Mitigation and assign a bandwidth priority level to the traffic. Cato Network Rules are pre-defined to meet common use-cases.

SASE 52

SASE Cloud Port Firewall 52

Kentik

DECEMBER 2, 2015

The issue was a new type of “spam reflection” that was causing headaches by allowing spammers to avoid detection while utilizing servers inside the customer’s network as spam sources. Here’s how these types of schemes work: The spammer sends a SYN from a spoofed source IP address to TCP port 25 (SMTP) on the target mail server.

TCP 40

TCP Protocol Port IP Address 40

CATO Networks

OCTOBER 30, 2019

We all get the concept: to transmit data over a TCP/IP network like the Internet requires the data be broken down into small packets (usually less than 1500 bytes) containing the relevant application data (payload) and headers. Misconfigured switches, routers, servers, or firewalls can lead to dropped packets. Network congestion.

WAN 52

WAN Routers TCP Protocol 52

CATO Networks

SEPTEMBER 11, 2023

allow users on the corporate VLAN to access printers located in the printer VLAN, over specific TCP ports. CCTV cameras), connected to an IOT-camera VLAN, to access the IOT File Server, but only over HTTPS. A LAN Firewall policy, implemented in the Cato Socket, allows the camera to access an internal CCTV server.

LAN 52

LAN Cloud Firewall WAN 52

Kentik

OCTOBER 11, 2016

It now ingests performance metrics like TCP retransmits and latency. We’ve enhanced the Kentik Detect big data analytics SaaS, which has always taken a broad range of data, from sFlow, NetFlow, and IPFIX, to BGP, SNMP, and geolocation.

TCP 40

TCP Network Networking Server 40

Confluent

JULY 1, 2019

port 53352 dst 54.191.84.122 port 9092 rank info not available TCP aux info available Connection to ec2-54-191-84-122.us-west-2.compute.amazonaws.com compute.amazonaws.com port 9092 [tcp/XmlIpcRegSvc] succeeded! compute.amazonaws.com:9092 --topic test >> $ kafka-console-consumer --bootstrap-server ec2-54-191-84-122.us-west-2.compute.amazonaws.com:9092

Port 101

Port IaaS DNS Network 101

The Network DNA

JUNE 3, 2024

The load balancer sends requests to defined endpoints in the backend pool, which fail if directed to an unavailable server. If we enable high-availability ports (only available on internal load balancers), this will remove the protocol options and enable load balancing on all ports for TCP and UDP protocols.

IP Address 52

IP Address Port Protocol Virtual machine 52

Kentik

AUGUST 28, 2019

For example: Transport options: Many choices like TCP, UDP, and gRPC. Which applications, clients, and servers are prominent on the highly-utilized links and can thus be used to make vaious optimization decisions (e.g., Session Initiation options: Dial-out (i.e., device sends data to collector) versus Dial-in (i.e.,

Network 16

Network Networking Protocol TCP 16